Color Registration Control (Color Shift Correction) System - Konica Minolta BizHub C360 Service Manual

9. WRITE SECTION (PH SECTION)
9.2.6

Color registration control (color shift correction) system

A. Overview of the registration control
• In a tandem engine, each four different color has an independent image reproduction
process. Color shift may occur because of variations in part accuracy. The color registra-
tion control system automatically detects color shift and correct color shift in the main
and sub scanning directions.
• The color shift detection sequence proceeds as follows. A detection pattern each in the
main scanning direction is produced at the front and rear on the transfer belt. Each of
IDC registration sensor/YC and /MK at the front and rear reads the corresponding pat-
tern. The amount of color shift in the sub scanning direction is then calculated and stored
in memory. A detection pattern each in the sub scanning direction is next produced at the
front and rear on the transfer belt. Each of IDC registration sensor/YC and /MK at the
front and rear reads the corresponding pattern. The amount of color shift in the main
scanning direction is then calculated and stored in memory. Based on the data repre-
senting the amounts of color shift, the machine calculates how much each of the different
colors should be corrected. The correction data is further stored in memory. Based on
the data stored in memory, the machine controls each dot during production of image
outputs, thereby correcting the color shift.
Detection pattern for sub
scanning direction
Transfer belt
Developing unit
40
Theory of Operation Ver. 1.0 Jul. 2009
Detection pattern for main
scanning direction
IDC registration sensor/YC
(IDCS/YC)
IDC registration sensor/MK
(IDCS/MK)
Drum unit
Print head unit
4038T2C007AA
A0EDT2C171DA